Furnace door



Patented July 3, 1928.

UNITED STATES* PATENT OFFICE.

JOHN H. UHRIG, OF BEVERLY, NEW JERSEY, ASSIGNOR TO UNITED STATES CAST IRON PIPE & FOUNDRY COMPANY, OFBURLINGTON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Application led July 28,

My invention relates to construction of. doors for highly heated furnaces and has for its object to provide a door of such construcf tion that it will not be injuriously affected by the great heat to which it is exposed. The nature of my improven'ients will be best understood as described in connection with the drawings in which theyl are illustrated and in lwhich Figure 1 is a front elevation of'my 1mproved door. n

Figure 2, a plan view of the door showing the channel beam which forms its top and the lifting bars by means of which the door is raised and lowered.

Figure 3 is a view of the channel beam forming the bottom of the door, the view showing the under side of the channel beam, and

Figure 4 is a sectional View of my door taken as on the section line 4 -4 of Fig. 1.

A is a channel beam having upwardly extending flanges A1 at its frontand back and, preferably, upwardly extending flanges, as indicated at A2,v at its ends. As shown, the channel beam is formed with downwardly extending portions indicated at A3, on each end, forming, so to speak, the foot of the door. Perforations A* are formed through the web of the channel beam to give passage to the lifting rods, to be described. B, B, etc. are rectangular plates forming the front wall of the gate or door and provided with hook like lugs B1 which extendI over the top edge of the front flange A1 of the channel beam A and with similar hook like lugs B2 near their upper edges, with the hooks extending upward. These front plates B, at their upper ends, indicated at B3, are prolonged so as to protect the lifting bars from the heat of the furnace. C, C, etc., are similar plates provided with .similar hook like lugs, the lower ones of which extend over the rear flange A1 of the channel bar A. D, D, are end plates provided with hook lugs D1 and D2, the lugs D2 extending over the upwardly extending flanges at the end of the channel bar A. E is a channel bar formed with downwardly extending flanges E1, which are engaged in the hook like lugs B2, C2 and D1- of the front, back and side plates of the door. F, F, etc. etc. are lifting rods which extend through the perforations A4 in the channel beam A and FURNACE DOOR.

1927. Serial N0. 209,036.1

are provided with heads F1 to engage on the under side of the channel beam; they extend through perforations in the channel beam E and are connected in pairs above the channel beam E by lifting bars G, to which in turn are secured the lifting chains indicated at H.

In practise, I form the channel bars A and E of a heat resisting metal alloy which I also use for the construction of the front and side plates B and D. The rear plates C, which are not directly exposed to the heat of the furnace, may be formed of a cheaper material. In practise, the space between the channel bars and between the front and back plates is packed with heat resisting material, not shown.

It will be obvious that by my construction all parts making up the door are supported on the beam channel A and are free to move with regard to this channel and each other without putting any undue strains on any portions of the door structure. The means through which the door is lifted comprises the rods F and equalizing bars G distribute the strain on the channel beam A to which rods F are connected.

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is:

. l. A furnace door comprising in combination a channel beam forming the bottom of the door, a series of metal plates forming the front and back faces of the door, resting on and loosely engaged with the flanges of the channel beam, a second channel beam resting on and loosely engaged with the front and back plates and means for raising and lowering the door connected to the lower channel beam.

2. A furnace door comprising in combination a channel beam having side and end flanges forming the. bottom of the door, a series of metal plates forming the front and back faces and side edges of the door, rest ing on and loosely engaged with the flanges of the channel beam, a second channel beam resting on and loosely engaged with the plates supported on the lower channel beam and means for raising and lowering the door connected to the lower channel beam.

3. A furnace door comprising in combination a channel beam forming the bottom of the door, a series of metal plates forming the front and back faces of the door rest-ing on and loosel engaged with the flanges of the channel gea-m, a second channel beam resting on and loosely engaged with the front and back plates and means for raising and lowering the door, consisting of lifting rods loosely engaging the lower channel beam and extending through the upper channel beam, beams connecting the upper ends of said rods in pairs and lifting means connected to said beams.

4. A furnace door comprising in combination a. channel beam forming the bottom of the door having upwardly extendlng side and end flan es, a series of plates forming the front an back faces, and the side edges of the door having hook like lugs on their inner face, resting on and engaged by the flanges of the bottom beam, said lates having also a secondset of hook li e lugs located near their topv and with the hooks extending upward, a second channel beam having downwardly extending side and end flanges resting on and engaged by the upper hook lugs of the plates and means connected with the bottom channel beam for raising and lowering the door.

JOHN H. UHRIG. 

